I've had a go at this tonight. I used Export in Settings-Library-Playlist, then searched in the music section of the phone's SD card from the computer. I found the playlists located after all the music files as an individual for for each playlist.
Before exporting I added 3 new playlists as a test, after exporting I deleted the first of these from my phone then copied it back from the computer into the SD card. After a rescan it was back & the tracks in it play as they should.
So that's great, I can now save a backup of my playlists.
There are a few glitches it would be desirable to sort out if it's not too difficult?
After exporting the playlists in Poweramp itself are duplicated with an M3U8 version of each, I'm thinking I can just delete them?
The test playlist has M3U8 in the title & I don't seem to be able to take it out.
I can't open the files in the computer & see the tracks in them. I can see they've got content as I can see they're different sizes, the longer playlists are as you'd expect bigger files& the shorter ones are smaller. I'm thinking as stated in the solution post above these files are written by the Android system & the Windows PC can't read them as they are. I'm thinking this isn't really a problem for me, I'm just wanting a backup just incase something happens to my phone rather than use these playlists on the PC itself.
Thanks for assistance, I do appreciate this is fairly simple stuff & the big problem is my leech of experience in computers etc. But there must be a good few like myself, would it be an idea to have guide to doing this in FAQ?