I swap the hard drive around, because I have too much free time.
If I get a machine with a harddrive, I usually make an image of it with a PC.
I use a compact flash card with an IDE adaptor.
When setting up a new installation.
I use a compact flash card with a PCMCIA adaptor.
I use some other form of removable solid-state media.
I have a multi card PCMCIA adaptor I also sometimes use.
I use CD-R(W)s.
CD-R is sometimes handy if you don't need to write anything to it on the Amiga.
I use the internet 8)
Or well, I use my LAN.