🚀 go-pugleaf

Once upon a time... I got a Mac and thought it was awsome. And I was
one of the first to buy Apple's first hard disk (for the Mac): HD20.
It was great....for a while...and then came HD20 SCSI, and mine was
suddenly a drag & no upgrade available. But it was still neat, fast
enough, lots of space....
  Somehow as it's been used more, it has become slower, and slower,
and ..... It's now to the point that booting up takes 2 min! (approx).
It's slower than a floppy drive! It's miserable, and I rather now
spend my time on a 80286 TTY than my once beloved Mac.
  Fragmentation sounds like a likely cause, but perhaps there is some
typical intrinsic problem with this hard disk.
  Questions:
   1) Should I reformat it? (It'll take forever to backup) Low-level
format?
   2) Any disk utilities (de-fragmentizers,diagnosing tools) out there
that I should get?
   3) Anything else I could do? (How much could I get for it, if I buy
a Jasmine instead....?)

I appreciate any advice on this,

Magnus