Keeping a copy of your buckets
Menu ☰ → Utilities → Backup/Restore → Back up to a file.
Your buckets live on this phone. If the phone is lost, or the app is removed and reinstalled, they go with it unless you have saved a copy.
Menu ☰ → Utilities → Backup/Restore → “Back up to a file”. Your phone then asks where to save the file: Drive, Files, or an email to yourself. Keep it somewhere other than this phone.
To bring it back: Menu ☰ → Utilities → Backup/Restore → “Restore from a file”, and pick the file. Everything goes back where it was — the buckets, what is in them, the names you typed on photos and who is in which picture.
The file holds your documents, but not your photos, contacts or appointments. It holds what you told Buckets about them, so it is not a substitute for backing up the phone. Documents make the file larger.
Restoring a file does not delete anything. It adds missing data and leaves existing data unchanged, so restoring the same file twice is safe. If an object in the file is no longer on the phone, Buckets reports how many objects were skipped. On a new phone, the photos, contacts and appointments must already be there. Buckets finds each photo and video by when it was taken and its name or size, each contact by name and a shared number or email, and each appointment by its title and start time. Anything that matches more than one thing is skipped and counted, so a bucket never lands on the wrong photo or person.