i have vackup issues for flat files. i found out that there's something wrong with VSS, DFS:
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C:\Windows\system32>vssadmin list writers
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2013 Microsoft Corp.
Writer name: 'Task Scheduler Writer'
Writer Id: {d61d61c8-d73a-4eee-8cdd-f6f9786b7124}
Writer Instance Id: {1bddd48e-5052-49db-9b07-b96f96727e6b}
State: [1] Stable
Last error: No error
Writer name: 'VSS Metadata Store Writer'
Writer Id: {75dfb225-e2e4-4d39-9ac9-ffaff65ddf06}
Writer Instance Id: {088e7a7d-09a8-4cc6-a609-ad90e75ddc93}
State: [1] Stable
Last error: No error
Writer name: 'Performance Counters Writer'
Writer Id: {0bada1de-01a9-4625-8278-69e735f39dd2}
Writer Instance Id: {f0086dda-9efc-47c5-8eb6-a944c3d09381}
State: [1] Stable
Last error: No error
Writer name: 'System Writer'
Writer Id: {e8132975-6f93-4464-a53e-1050253ae220}
Writer Instance Id: {9e7d8df3-32c1-4df8-921e-b9df7a708ecd}
State: [1] Stable
Last error: No error
Writer name: 'ASR Writer'
Writer Id: {be000cbe-11fe-4426-9c58-531aa6355fc4}
Writer Instance Id: {29f93b7c-43c8-4df8-a9e2-e1bb9589a316}
State: [1] Stable
Last error: No error
Writer name: 'FSRM Writer'
Writer Id: {12ce4370-5bb7-4c58-a76a-e5d5097e3674}
Writer Instance Id: {a5c8ab81-86ad-44b0-bcb6-9910af1f757b}
State: [5] Waiting for completion
Last error: No error
Writer name: 'DFS Replication service writer'
Writer Id: {2707761b-2324-473d-88eb-eb007a359533}
Writer Instance Id: {89ae454e-4967-48e8-bd72-4eb780664810}
State: [5] Waiting for completion
Last error: No error
Writer name: 'WMI Writer'
Writer Id: {a6ad56c2-b509-4e6c-bb19-49d8f43532f0}
Writer Instance Id: {e9bfa7e1-b08f-4177-98b5-4b6eb72dec2d}
State: [1] Stable
Last error: No error
Writer name: 'Shadow Copy Optimization Writer'
Writer Id: {4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f}
Writer Instance Id: {94bf5723-88fa-49d6-9076-2ebb3d7a1b2e}
State: [1] Stable
Last error: No error
Writer name: 'COM+ REGDB Writer'
Writer Id: {542da469-d3e1-473c-9f4f-7847f01fc64f}
Writer Instance Id: {940fe263-95bf-48f5-a213-f55fb3ec4b76}
State: [1] Stable
Last error: No error
Writer name: 'Registry Writer'
Writer Id: {afbab4a2-367d-4d15-a586-71dbb18f8485}
Writer Instance Id: {5e90160d-f0b0-42cf-8aae-4f5ffe4b722c}
State: [1] Stable
Last error: No error
C:\Windows\system32>vssadmin list providers
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2013 Microsoft Corp.
Provider name: 'SmVssProvider'
Provider type: Hardware
Provider Id: {24e4e8a3-69cb-4370-8b7b-c5276cd49765}
Version: 11.10.0001
Provider name: 'Microsoft File Share Shadow Copy provider'
Provider type: Fileshare
Provider Id: {89300202-3cec-4981-9171-19f59559e0f2}
Version: 1.0.0.1
Provider name: 'Microsoft Software Shadow Copy provider 1.0'
Provider type: System
Provider Id: {b5946137-7b9f-4925-af80-51abd60b20d5}
Version: 1.0.0.7