I want to upgrade mastodon, but have space problems on my VPS, making it impossible for mastodon to create backups. I I want to add an extra volume of 10 GB to my VPS to fix this, but what can I put there, to free enough space for the update? And how do I do it?
not sure who you VPS with, but you might need to change your VPS plan to a high plan and it should auto convert the hard drive size for you to the next larger disk space.
or you can try to backup small apps on yunohost ONE at a time, going to new back up, under system select non, under apps select non, then select ONLY the 1 app to backup, if it works download it, then delete it once download, then go to app uninstall that app, then do this with the other apps till you have enough space, then try to upgrade, once upgrade is done, and mastodon works, delete the backup file of mastodon then restore the apps.