In my experience, yes. Kestrel peeps can probably add to this.I'm sure this is my poor search-fu or something, but can't seem to find the answer? Apologies for being dumb...
Does the KestrelLiNK Ballistics app back up things like DSF, bullet length (if input via Kestrel), etc? (ie, all of the stuff you can edit in the gun profile on the Kestrel itself that isn't reflected in the profile editor in the app?)
If you have a synched profile (from Kestrel to phone) with DSF inputs and you delete it from the Kestrel then re-sync it to the Kestrel again (phone to Kestrel), the DSF, offsets, etc. are all restored.