Can I delete incremental backups made with Déjà Dup?

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http://askubuntu.com – After using Déjà Dup for a while, I keep getting this error after every attempt at a backup: Backup location is too small. Try using one with more space. Could I delete some backups made of certain dates only? For example, could I delete all backups older than a month? My backup folder contains 372 files, with names like: duplicity-full.20121122T124053Z.manifest.gpg duplicity-full.20121122T124053Z.vol100.difftar.gpg duplicity-full-signatures.20121122T124053Z.sigtar.gpg duplicity-inc.20121122T124053Z.to.20121129T151249Z.manifest.gpg duplicity-inc.20121122T124053Z.to.20121129T151249Z. (HowTos)