Backups & restore points · Versions and restoring
How long does Data Backup keep old versions?
Short answer: Recent versions are kept in full, then thinned to one a day, one a week and one a month further back, so history stays long without growing forever.
Data Backup keeps a long history but thins it as it ages, so a backup doesn't grow forever: recent versions are kept in full, then one a day, then one a week, then one a month further back.
In practice you can go back to any recent change, to a specific day over the following period, and to a weekly or monthly point beyond that. If something matters at a particular moment — before a big edit, say — press Back up now so there's a version from exactly then.