For many years I have been struggling with external storage space to daily backup my ZODB Data.fs projects until I found Borg Backup (https://www.borgbackup.org/). It is truly a incremental backup even for the huge Data.fs, really save me a lot of backup space.
My use case is I need to backup Data.fs everyday for many years. The storage would be humongous even with collective.recipe.backup.
Borg can also backup blobs storage effectively.
Borg Backup can be a supplement or replacement of collective.recipe.backup.