My configuration is more or less similar to the one used by @Nido , except that my “external” backup is just a folder I configured in Nextcloud, and it gets backed up to my other devices (a desktop computer, and my laptop). I just placed this script on /etc/cron.weekly to run weekly:
#!/bin/bash
defaultfolder="/home/yunohost.backup/archives"
#I use the multimedia folder to store my archives. Substitute the target folder for your own user.
targetfolder="/home/yunohost.multimedia/csolisr/archives/ynh_backup"
#Compression format. I generally use .gz as that's the format that Yunohost uses natively to compress.
cmp="gz"
#You can set this parameter to have multiple copies of each backup.
maxbackupnumber=1
#This iterates through all your installed YNH apps
for app in $(/usr/bin/yunohost app list | /usr/bin/grep "id:" | /usr/bin/sed "s/.*id\: //g")
do
appbackup="$app"_backup
#If old backup exists, find a free spot and rename it
if [[ ! -z $(/usr/bin/yunohost backup list | /usr/bin/grep $appbackup) ]]
then
spotfound=0
backupnumber=1
while [[ spotfound -eq 0 ]]
do
if [[ -f "$defaultfolder/$appbackup_$backupnumber.tar" || -f "$defaultfolder/$appbackup_$backupnumber.tar.$cmp" ]]
then
backupnumber=$((backupnumber+1))
else
spotfound=1
fi
done
if [[ $backupnumber -lt $maxbackupnumber ]]
then
appbackupnumber="$appbackup"_"$backupnumber"
mv "$defaultfolder/$appbackup.info.json" "$defaultfolder/$appbackupnumber.info.json" -v
mv "$defaultfolder/$appbackup.tar" "$defaultfolder/$appbackupnumber.tar" -v #|| \
mv "$defaultfolder/$appbackup.tar.$cmp" "$defaultfolder/$appbackupnumber.tar.$cmp" -v
#Do the same in the backup target
mv "$targetfolder/$appbackup.info.json" "$targetfolder/$appbackupnumber.info.json" -v
mv "$targetfolder/$appbackup.tar.$cmp" "$targetfolder/$appbackupnumber.tar.$cmp" -v
else
if [[ $backupnumber -eq 1 ]]
then
appbackupnumber="$appbackup"
else
appbackupnumber="$appbackup"_"$backupnumber"
fi
rm "$defaultfolder/$appbackupnumber.info.json"
rm "$defaultfolder/$appbackupnumber.tar" #|| \
rm "$defaultfolder/$appbackupnumber.tar.$cmp"
#Do the same in the backup target
rm "$targetfolder/$appbackupnumber.info.json"
rm "$targetfolder/$appbackupnumber.tar.$cmp"
/usr/bin/yunohost backup delete "$appbackupnumber"
fi
fi
#Create the backup
/usr/bin/yunohost backup create --apps $app --name "$appbackup"
#Compress and move the backup
cp "$defaultfolder/$appbackup.info.json" "$targetfolder/$appbackup.info.json" -v
cp "$defaultfolder/$appbackup.tar.$cmp" "$targetfolder/" -v || \
cp "$targetfolder/$appbackup.tar.$cmp" "$defaultfolder/" -v
done
#System = ynh_core_backup
if [[ ! -z $(/usr/bin/yunohost backup list | /usr/bin/grep "ynh_core_backup") ]]
then
spotfound=0
backupnumber=1
while [[ spotfound -eq 0 ]]
do
if [[ -f "$defaultfolder/ynh_core_backup_$backupnumber.tar" || -f "$defaultfolder/ynh_core_backup_$backupnumber.tar.$cmp" ]]
then
backupnumber=$((backupnumber+1))
else
spotfound=1
fi
done
if [[ $backupnumber -lt $maxbackupnumber ]]
then
appbackupnumber=ynh_core_backup_"$backupnumber"
mv "$defaultfolder/ynh_core_backup.info.json" "$defaultfolder/$appbackupnumber.info.json" -v
mv "$defaultfolder/ynh_core_backup.tar" "$defaultfolder/$appbackupnumber.tar" -v #|| \
mv "$defaultfolder/ynh_core_backup.tar.$cmp" "$defaultfolder/$appbackupnumber.tar.$cmp" -v
#Do the same in the backup target
mv "$targetfolder/ynh_core_backup.info.json" "$targetfolder/$appbackupnumber.info.json" -v
mv "$targetfolder/ynh_core_backup.tar.$cmp" "$targetfolder/$appbackupnumber.tar.$cmp" -v
else
if [[ $backupnumber -eq 1 ]]
then
appbackupnumber="ynh_core_backup"
else
appbackupnumber=ynh_core_backup_"$backupnumber"
fi
rm "$defaultfolder/$appbackupnumber.info.json"
rm "$defaultfolder/$appbackupnumber.tar" #|| \
rm "$defaultfolder/$appbackupnumber.tar.$cmp"
#Do the same in the backup target
rm "$targetfolder/$appbackupnumber.info.json"
rm "$targetfolder/$appbackupnumber.tar.$cmp"
/usr/bin/yunohost backup delete "$appbackupnumber"
fi
fi
/usr/bin/yunohost backup create --system conf_ldap conf_ynh_settings conf_ynh_certs data_mail data_xmpp conf_manually_modified_files --name "ynh_core_backup"
#Compress and move the backup
cp "$defaultfolder/$appbackup.info.json" "$targetfolder/$appbackup.info.json" -v
cp "$defaultfolder/ynh_core_backup.tar.$cmp" "$targetfolder/" -v || \
cp "$targetfolder/ynh_core_backup.tar.$cmp" "$defaultfolder/" -v
#Fix permissions
rsync -rtvz $defaultfolder/ $targetfolder
find $targetfolder/* -type f -name '*' -not -user nextcloud -exec chown -R nextcloud:nextcloud {} \;
find $targetfolder/* -type f -name '*' -not -perm 777 -exec chmod 777 {} \;
#Substitute your folder here as well
sudo -u nextcloud php8.2 --define apc.enable_cli=1 /var/www/nextcloud/occ files\:scan --all --path="/csolisr/files/Multimedia/archives"