I recently stumbled across this YouTube channel, Guitare Improvisation, owned by a French guitarist with some great jazz and gypsy jazz backing tracks. There are several lesson videos associated with the channel as well. Though the lessons are in French, most seem to include English subtitles. Below are 5 backing tracks from Guitare Improvisation to check out.
F Minor Blues (Jazz/Swing Feel) 150bmp
Blue Bossa (Gypsy) 150bpm
Bb7 Eb7 F7 (Jazz/Swing feel) 130 bpm
C C° C G7 (Gypsy) 160 bpm
Indifférence (Gypsy) 190bpm