I issued the following command on the destination machine directly, and it threw up.
backup@hoshira:~$ sudo mkdir -p "/mnt/backupuuid/mnt/test/.Private/ECRYPTFS_FNEK_ENCRYPTED.FWYZkOJAsGSXo-S.cpRFq3wvU.Dtozd29e1O4rDGDN9cc6pEme5GOKs67U--/ECRYPTFS_FNEK_ENCRYPTED.FXYZkOJAsGSXo-S.cpRFq3wvU.Dtozd29e1Oj3Vo5jUgBfJ.o-NKs.75Rbf3tBnbdAGWQ29J2e5laBE-/ECRYPTFS_FNEK_ENCRYPTED.FWYZkOJAsGSXo-S.cpRFq3wvU.Dtozd29e1OnAMGEJ-0sE.Yiwc37kTNQk--/ECRYPTFS_FNEK_ENCRYPTED.FbYZkOJAsGSXo-S.cpRFq3wvU.Dtozd29e1OwVHHPKxU7rcIFxmidLe3rp8pLAFfEgvTPilQAb4uRdmqWVGPNC9iGn5.W-fCXDmqHBnVSSWE2Nuj6l6JAUSwwOjvStnWm3f2u1mp4iaKbgmNHIlyr7wCHIS.CHnK-H.E"
mkdir: cannot create directory `/mnt/backupuuid/mnt/test/.Private/ECRYPTFS_FNEK_ENCRYPTED.FWYZkOJAsGSXo-S.cpRFq3wvU.Dtozd29e1O4rDGDN9cc6pEme5GOKs67U--/ECRYPTFS_FNEK_ENCRYPTED.FXYZkOJAsGSXo-S.cpRFq3wvU.Dtozd29e1Oj3Vo5jUgBfJ.o-NKs.75Rbf3tBnbdAGWQ29J2e5laBE-/ECRYPTFS_FNEK_ENCRYPTED.FWYZkOJAsGSXo-S.cpRFq3wvU.Dtozd29e1OnAMGEJ-0sE.Yiwc37kTNQk--/ECRYPTFS_FNEK_ENCRYPTED.FbYZkOJAsGSXo-S.cpRFq3wvU.Dtozd29e1OwVHHPKxU7rcIFxmidLe3rp8pLAFfEgvTPilQAb4uRdmqWVGPNC9iGn5.W-fCXDmqHBnVSSWE2Nuj6l6JAUSwwOjvStnWm3f2u1mp4iaKbgmNHIlyr7wCHIS.CHnK-H.E': File name too long
ok, this doesn't look like rsync's fault at all
I issued the following command on the destination machine directly, and it threw up. d/mnt/test/ .Private/ ECRYPTFS_ FNEK_ENCRYPTED. FWYZkOJAsGSXo- S.cpRFq3wvU. Dtozd29e1O4rDGD N9cc6pEme5GOKs6 7U--/ECRYPTFS_ FNEK_ENCRYPTED. FXYZkOJAsGSXo- S.cpRFq3wvU. Dtozd29e1Oj3Vo5 jUgBfJ. o-NKs.75Rbf3tBn bdAGWQ29J2e5laB E-/ECRYPTFS_ FNEK_ENCRYPTED. FWYZkOJAsGSXo- S.cpRFq3wvU. Dtozd29e1OnAMGE J-0sE.Yiwc37kTN Qk--/ECRYPTFS_ FNEK_ENCRYPTED. FbYZkOJAsGSXo- S.cpRFq3wvU. Dtozd29e1OwVHHP KxU7rcIFxmidLe3 rp8pLAFfEgvTPil QAb4uRdmqWVGPNC 9iGn5.W- fCXDmqHBnVSSWE2 Nuj6l6JAUSwwOjv StnWm3f2u1mp4ia KbgmNHIlyr7wCHI S.CHnK- H.E" d/mnt/test/ .Private/ ECRYPTFS_ FNEK_ENCRYPTED. FWYZkOJAsGSXo- S.cpRFq3wvU. Dtozd29e1O4rDGD N9cc6pEme5GOKs6 7U--/ECRYPTFS_ FNEK_ENCRYPTED. FXYZkOJAsGSXo- S.cpRFq3wvU. Dtozd29e1Oj3Vo5 jUgBfJ. o-NKs.75Rbf3tBn bdAGWQ29J2e5laB E-/ECRYPTFS_ FNEK_ENCRYPTED. FWYZkOJAsGSXo- S.cpRFq3wvU. Dtozd29e1OnAMGE J-0sE.Yiwc37kTN Qk--/ECRYPTFS_ FNEK_ENCRYPTED. FbYZkOJAsGSXo- S.cpRFq3wvU. Dtozd29e1OwVHHP KxU7rcIFxmidLe3 rp8pLAFfEgvTPil QAb4uRdmqWVGPNC 9iGn5.W- fCXDmqHBnVSSWE2 Nuj6l6JAUSwwOjv StnWm3f2u1mp4ia KbgmNHIlyr7wCHI S.CHnK- H.E': File name too long
backup@hoshira:~$ sudo mkdir -p "/mnt/backupuui
mkdir: cannot create directory `/mnt/backupuui